I would argue that this is the defining factor in what makes someone intelligent or not. If you're always revising your ways of thinking about a problem, your probability of converging on a solution is vastly greater than someone with a narrow, one-track focus. In fact, another article on the HN homepage ( http://blogs.scientificamerican.com/streams-of-consciousness... ) elaborates on this point of trying multiple "s…
Every argument with such people is a downhill battle. I have yet to find out how to open their minds to broader perspectives. It's always back to the allegory of the cave. Even when you have them in a corner with no possible arguments, they'd still ask "why would I need that?".
People need to be curious in order to be open-minded. It's quite hard to stay curious as an adult in this world while it is inborn to children. I get extremely curious about quite a few domains myself at the cost of alienating a quite few people when I talk about them.
I found out these people are almost always very attached to their past work, and tend to do everything else in the same general direction. They are dead afraid if they change their mind, people will think everything they did before is worth nothing and so are they.
They are devoted to their tools and methods rather than their general domain of work. Tools and methods come, evolve and go but the domain they represent always endures time.